【发布时间】：2018-08-17 02:07:34
【问题描述】：
错误信息： 注意：未定义的索引：draw。
另外，我的 JSON 响应出现错误：{"draw":0,"recordsTotal":23,"recordsFiltered":23,"data":[]}
....draw（上图）应该是 1 而不是 0。
代码：
$(document).ready(function() {
var asc = true;
$('#example').DataTable( {
"processing": true,
"serverSide": true,
"ajax": {
"url": "server.php",
"type": "POST",
},
columnDefs: [{
targets: -1,
defaultContent: '<button type="button">Delete</button>'
}],
rowGroup: {
dataSrc: 1
}
});
});
</script>
<body>
<table id="example" class="display" style="width:100%" class="table table-striped table-bordered table-hover table-condensed">
<thead class="thead-inverse">
<tr>
<th> ID </th>
<th>First Name </th>
<th>Last Name </th>
<th>Position </th>
<th>Date </th>
<th>Updated </th>
<th>Action</th>
</thead>
</tr>
<tbody>
</tbody>
</table>
</div>
<?php
$data=array();
$requestData= $_REQUEST;
$count=mysqli_query($con, "SELECT * FROM employees");
$totalData= $count->num_rows;
$totalFiltered=$totalData;
$json_data = array(
"draw" => intval( $requestData['draw'] ), // for every request/draw by clientside , they send a number as a parameter, when they recieve a response/data they first check the draw number, so we are sending same number in draw.
"recordsTotal" => intval( $totalData ),
"recordsFiltered" => intval( $totalFiltered ),
"data" => $data // total data array
);
echo json_encode($json_data);
?>
</script>
<body>
<?php
$data=array();
$requestData= $_REQUEST;
$query=mysqli_query($con, "SELECT * FROM employees");
$totalData= $count->num_rows;
$totalFiltered=$totalData;
if( !empty($requestData['search']['value']) ) {
// if there is a search parameter
$sql = "SELECT first_name, last_name, position, date, updated";
$sql.=" FROM employees";
$sql.=" WHERE first_name LIKE '".$requestData['search']['value']."%' ";
// $requestData['search']['value'] contains search parameter
$sql.=" OR last_name LIKE '".$requestData['search']['value']."%' ";
$sql.=" OR position LIKE '".$requestData['search']['value']."%' ";
$sql.=" OR date LIKE '".$requestData['search']['value']."%' ";
$sql.=" OR updated LIKE '".$requestData['search']['value']."%' ";
$query=mysqli_query($con, $sql);
$totalFiltered = mysqli_num_rows($query); // when there is a search parameter then we have to modify total number filtered rows as per search result without limit in the query
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // $requestData['order'][0]['column'] contains colmun index, $requestData['order'][0]['dir'] contains order such as asc/desc , $requestData['start'] contains start row number ,$requestData['length'] contains limit length.
$query=mysqli_query($con, $sql); // again run query with limit
} else {
$sql = "SELECT first_name, last_name, position, date, updated";
$sql.=" FROM employees";
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." ";
$query=mysqli_query($con, $sql);
}
$data = array();
while( $row=mysqli_fetch_array($query) ) { // preparing an array
$nestedData=array();
$nestedData[] = $row["titulo"];
$nestedData[] = $row["descripcion"];
$data[] = $nestedData;
}
?>
很有可能我不会得到答案。但觉得值得一试。我仍在等待来自 datatables.net 的回复。谢谢。
Server.php 文件：
<?php
$table = 'employees';
$primaryKey = 'id'; // Table's primary key
$columns = array(
array( 'db' => 'id', 'dt' => 0 ),
array( 'db' => 'first_name', 'dt' => 1 ),
array( 'db' => 'last_name', 'dt' => 2 ),
array( 'db' => 'position', 'dt' => 3 ),
array( 'db' => 'date', 'dt' => 4 ),
array( 'db' => 'updated', 'dt' => 5 ),
);
$sql_details = array(
'user' => 'username',
'pass' => 'password',
'db' => 'database',
'host' => 'localhost'
);
require( 'ssp.class.php' );
echo json_encode(
SSP::simple( $_GET, $sql_details, $table, $primaryKey, $columns )
);
?>
【问题讨论】：
-
那些只是警告，你可以让他们沉默访问这个答案stackoverflow.com/questions/19938003/… 但你为什么不传递任何 $_GET 数据？当您的代码需要时
-
你指的是这个吗？ "draw" => intval( $requestData['draw'] ) 应该是 requestData 没有得到。我正在尝试两种方式。我删除了 get['draw']。
-
是的，错误似乎很小，因为整个数据表仍然有效。我只是好奇我是否错过了触发 draw 为 0 而不是 1 的东西。
-
这是一个 PHP 通知，Datatables 只是传递它。意思是您的
draw数组元素不存在。您可以使用isset()或array_key_exists()检查它是否存在，并在那里处理它，但这并不能真正解决您的问题（我怀疑您得到一个零值，因为索引不存在)。你有没有进入 PHP 并在那里转储记录以查看其中的实际内容？ -
好的。有人发布了与您的评论类似的答案。我正在集思广益解决问题的几种方法..
标签： javascript json ajax datatable